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Best Vitamin K Supplements

Updated April 2022
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Best of the Best
Thorne Research 3-K Complete
Thorne Research
3-K Complete
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Trusted Brand
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Three forms of K vitamins in one supplement produced by a brand known for quality products and ingredients.


Contains 3 clinically studied forms of vitamin K for diverse benefits. Supports healthy blood clotting, strong bones, artery health, and elasticity. Contains much more MK-4 than many other multi-K formulas. Free of artificial preservatives and most allergens.


Some feel these are a bit pricey.

Best Bang for the Buck
Vital Nutrients Vitamin K2-7 + D3
Vital Nutrients
Vitamin K2-7 + D3
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Vitamin D Boost
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A synergistic combination of vitamin K2-7 and D3 that promotes health in several bodily systems and structures.


Both vitamins work together to support bone health and calcium metabolism. D3 boosts absorption and reduces excretion of calcium, while vitamin K2-7 works to promote optimum cardiac and vascular functioning.


Needs to be taken with a meal or healthy dietary fat.

Bronson Vitamin K Triple Play
Vitamin K Triple Play
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Customer Favorite
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Provides health benefits to diets that are already vitamin-rich.


We love that some side effects include softer, glowing skin. Customers report myriad benefits that include improving the effects of anti-inflammatory drugs to helping heal from a new tattoo. Made in USA at FDA CGMP registered facility.


Be mindful of effects if taking other supplements.

ELDERBERRY HILL ORGANICS Vitamin K2 MK7 Liquid Drops for Bone Density
Vitamin K2 MK7 Liquid Drops for Bone Density
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Most Eco-friendly
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Safe and effective option improves bone strength and flow of nutrients within blood stream.


Improves bone strength and nutrient flow. Tasteless serum made with natural olive oil. Contains neither unnecessary ingredients nor preservatives. Compact and portable. Fits inside traveling bags and pockets. Not a pill; easy to take. Made by experts.


Few servings per container, so regular users may have to repurchase frequently.

NutriGold Vitamin K2 MK-7 Gold
Vitamin K2 MK-7 Gold
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Optimum Bioavailability
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A vegan formulation of vitamin K2 with organic olive oil for superior bioavailability.


Vitamin K2 promotes calcium absorption for bone health and optimum heart and kidney functioning. Organic olive oil enhances the body’s ability to absorb the fat-soluble vitamin. Made with a form of K2 that helps keep vitamin levels stable in the blood.


Longtime users report a recent change in the shape and size of these capsules that disappointed them.

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BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We only make money if you purchase a product through our links, and all opinions about the products are our own. About BestReviews  
BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We buy all products with our own funds, and we never accept free products from manufacturers.About BestReviews 

We recommend these products based on an intensive research process that's designed to cut through the noise and find the top products in this space. Guided by experts, we spend hours looking into the factors that matter, to bring you these selections.

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Buying guide for best vitamin k supplements

Vitamin K is one of four fat-soluble vitamins; the other three are vitamins A,E, and D. Vitamin K’s main role is to transport calcium to the bones in order to improve mineral density and prevent calcium accumulation and deadly blockages. This vitamin isn’t just a single nutrient: it’s a family of compounds, just like vitamin B.

When it comes to meeting your daily requirement of vitamin K, you may need the assistance of a vitamin K supplement, which provides nutrition where food sometimes can’t. Naturally, vitamin K1 is found in foods such as kale, broccoli, green beans, eggs, and strawberries. Vitamin K2 can be found mostly in fermented foods and animal products sourced from pasture-grown livestock. Since these are not often consumed regularly, especially for vegetarians and vegans, the need for a K2 supplement becomes more essential.

Navigating the world of vitamin K supplements can be difficult with such a multitude of choices available. Read on for information that will help you make the best choice.

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Use vitamin K for added benefits like whiter teeth, a healthier dentist visit, and improved skin.

The body’s need for vitamin K

Vitamin K helps the body thrive by maintaining bone and blood vessel health. It also promotes the swift and healthy healing of wounds. While vitamin K is beneficial on its own, it works best when combined with vitamin D, which facilitates the proper absorption of calcium. Vitamin K2 directs calcium to the bones rather than the arteries, where calcification poses a risk.

Vitamin K supplementation is used by those who drink alcohol heavily, those with GI disorders that prevent vitamin K absorption, and those who take drugs that interfere with absorption, among others. Low levels of vitamin K can increase your risk of uncontrolled bleeding.

Types of vitamin K

K1 (phylloquinone) and K2 (menaquinone) are the main forms of vitamin K that are available in fat-soluble supplement form. The need for K2 vitamin supplements arises when individuals don’t consume a high volume of animal products or fermented food. The need for K1 becomes eminent if you can’t stand kale or spinach. K1 is responsible for blood coagulation and clotting, whereas K2 is used more prevalently for heart and bone disease prevention.

Within K2, there are vitamins MK4 and MK7. While MK4 usually comes from the tobacco plant and leaves the body relatively soon after entering it, MK7 is usually sourced from chickpeas, which offers more sustained protection. MK4 and MK7 are found in liquid or capsule form, often in soy-free, non-GMO, gluten-free, and vegetarian options.

There is a third type of vitamin K, known as K3, but since it is a synthetic version with potentially harmful health effects, we’ll be focusing on K1 and K2 here.

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Did you know?
It’s not unusual for newborn babies to be given a shot of vitamin K after birth, as infants are naturally born with lower levels of it, and it prevents internal bleeding.


Vitamin K supplement dosage needs to be adjusted based on gender and age, as an excessively high dosage can be dangerous. Adult men require 120 micrograms, while adult women need 90 micrograms. Teens are advised to take 75 micrograms a day, while children between the ages of nine and 13 are limited to a daily intake of 60 micrograms. Those suffering from bleeding disorders like hypoprothrombinemia are generally advised to take between 2.5 and 25 mg of K1 but should consult their doctors before committing to any dose.

Side effects

While some individuals may require a K1 or K2 supplement, if you’re eating K2-rich foods and are otherwise healthy, the need may not arise. Side effects can occur, but they are rare. These include swelling or itching, dizziness, difficulty breathing, and increased risk of bleeding when combined with certain drugs or antibiotics.

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While vitamin K1 and K2 are completely safe, vitamin K3 (or menadione) is a synthetic form of the vitamin that is considered toxic when consumed in high doses, potentially causing cytotoxicity in the liver, allergic reactions, and forms of anemia.

Additional ingredients

The following ingredients are included in some, but not all, vitamin K supplements.

Coconut oil or extra virgin olive oil: Vitamin K is fat-soluble, and these added oils may enhance its absorption.

Vitamin D: Since vitamin D and vitamin K work optimally in conjunction, they are often combined.

Maltodextrin: Maltodextrin is produced from starch and is used as a food additive. Although approved by the FDA, it is high on the glycemic index and not suitable for those who are sensitive to allergies.

Magnesium stearate: This is a commonly used additive in supplements, and in small amounts, it’s generally harmless. However, it is hydrophobic, which means it may slow the rate of absorption in your GI tract or have a laxative effect in large doses.

Vitamin K supplement prices

To make sure you’re optimizing your value, it’s a good idea to calculate exactly how many servings the bottle contains in the context of the total cost. The reason: when purchased in larger quantities, you may save a significant amount. For instance, a 90-capsule bottle may end up costing you 0.17 cents per pill, whereas a 180-capsule bottle may cost you 0.11 cents per pill. On average, a vitamin K supplement costs around 0.14 cents to 0.30 cents per pill, with D3-enhanced products potentially costing up to a dollar per pill.

Pay attention not just to price but also to what additives and additional ingredients are in any  supplement you’re considering. If the price is decent and competitive with other vitamin K supplements and the product contains vitamin D, you’re getting more value out of your purchase. Vitamin K supplements bolstered with vitamin D or high-end ingredients like coconut oil often cost more, but the investment may be worth it, depending on your goals.

As always, be sure to consult with your doctor before starting a new supplement regimen.

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Expert Tip
Vitamin K can aid in lightening heavy menstrual periods without the usage of hormonal birth control, thanks to its coagulation properties. However, be sure to consult your doctor first.


  • Consistency is key. Take your supplement daily with a meal for best results.

  • Always check the expiration date on your supplements. Make sure you’re only consuming healthy, non-expired ingredients that work to their maximum capabilities.

  • Check for ingredients which may conflict with your lifestyle or existing allergies. Some brands offer vegetarian, soy-free, or gluten-free options.

  • If you’re taking the drug Coumadin, which is used to slow blood clotting, consult your doctor before usage. A vitamin K supplement may decrease the effectiveness of this drug.

  • Try to combine your vitamin K supplement with a vitamin D supplement if you’re not taking a two-in-one combination already. They enhance each others’ functions.

Other products we considered

For those who prefer not to take their supplements in pill form, MaryRuth’s Organics MK7 Vitamin K2 drops offers an all-natural, organic alternative in the form of concentrated drops with a mild olive oil taste. Using the chickpea extract MK7, this vegan formula is plant-based, non-GMO, ketogenic, paleo, corn-free, soy-free, nut-free, and wheat-free. In other words, it’s suitable for many people with allergies.

Alternatively, we suggest Vitamin K Triple Play by Bronson. A crowd favorite, this supplement covers all three bases by combining K1, K2 MK7, and K2 MK4. Coming from a trusted and reputable company, these soft capsules are available in quantities of 90 and 180.

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Vitamin K is absorbed best with healthy fats. For this reason, it is suggested that individuals consume veggies high in vitamin K while they are also consuming a fat — ideally a fermented one such as kefir yogurt.


Q. Can too much vitamin K be harmful?
If you have diabetes and are taking a K1 supplement, blood sugar levels need to be monitored closely. If you are receiving dialysis, excessively high doses of vitamin K may in fact worsen clotting issues.

Q. What are some symptoms of low vitamin K?
If you have a vitamin K deficiency, you might bruise easily, see blood in your urine or stool, or have unusually heavy menstrual periods.

Q. Which drugs interfere with the effects of a vitamin K supplement?
Drugs for cancer, high cholesterol, and seizures may interfere with vitamin K supplementation, as well as antacids, blood thinners, aspirin, and certain antibiotics.